<template>
  <div id="app">
    <div class="box">
      <div class="left"></div>
      <div class="center"></div>
      <div class="right"></div>
    </div>
  </div>
</template>

<script>
import HelloWorld from './components/HelloWorld.vue'

export default {
  name: 'App',
  components: {
    HelloWorld
  }
}
</script>

<style>
* {
  margin:0;
  padding: 0;
  box-sizing: border-box;
}
.box {
  display: flex;
  width: 100%;
  height: 300px;
}
.left {
  flex: 1;
  background-color: red;
}
.center {
  flex: 1;
  background-color: green;
}
.right {
  flex: 1;
  background-color: orangered;
}
</style>
